Can anyone provide an explanation as to why GM added two strut bars from the frame to engine sub frame on the 2WD Silverado? My 2000 did not have it. My 2006 does. I think it was added in the 03 year or there abouts. My 06 2WD CC 1500 has too much noise from the front suspension when running at low speed over washboard type road surfaces (sort of a hollow clunking noise).